Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94dccbe4a7f38c5…

MALICIOUS

PDF

82.0 KB Created: 2021-03-28 04:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d16cb8e9bc25b118f799497cdbd27f78 SHA-1: 5133d8ca31b8bc76aefb443b84fe38957e273ba8 SHA-256: f94dccbe4a7f38c58bf8a1b55b71ada00168f15b8f64e9738e37b0ea818a0831
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/award?keyword=anatomy+and+character+design+books+for+artists+pdf PDF link annotation
    • https://cdn.sqhk.co/rolileduvof/hhghegg/cashback_deals_sim_only.pdfIn PDF document text
    • http://uablog.site/daily_health_tips_apprbvtm.pdfIn PDF document text
    • https://pivokobofu.weebly.com/uploads/1/3/4/6/134648089/40e88c1520e.pdfIn PDF document text
    • https://tofigota.weebly.com/uploads/1/3/0/7/130775321/gonakenarutev.pdfIn PDF document text
    • https://wekubobezug.weebly.com/uploads/1/3/1/3/131383536/xoremobixakoz-rexaxizere-wuvoremudire.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/nanifebafukanekimoj.pdfIn PDF document text
    • http://reactivaperu-2020.com/biostatistics_multiple_choice_questipbeon.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/jejdjaC/adobe_scanner_app_android.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/7912644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d9b0daee-351d-47ce-aa73-ba5edf578b20/fanefonegazogizajoteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257893be-4a4a-44b5-85b3-f3389c504101/94866622539.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/surefire_cpr_nrp_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/rukezusubovepuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a4a5ba-386a-4565-8156-f1db9e5d3940/israel_kamakawiwoole_somewhere_over_the_rainbow_ukulele_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65038f15-b226-4dc7-8fe4-545c4c3f1780/legimilabenod.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/addressing_formal_letter_to_unknown_recipient.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cd088c-007a-410b-b3bd-e67bdca3377d/night_shift_santilli_beer_advocate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23208d6d-a01e-47ec-917f-b1c62d75d3d9/premier_protein_shakes_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/google_analytics_conversion_funnel_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/batowimu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 5620 bytes
SHA-256: 959556254fa1282781c55a440a415146b3c209a93f6eafeac083ac7d692beac3
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10936 bytes
SHA-256: ba51b02972e365dda0d9dd7f7ead5631b6550065575949d27391bc33e9ac0253
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230